code: def download_asset(
      key: str,
      hash: str = "",
      path: Union[str, PathLike] = "",
      *,
      progress: bool = True,
  ) -> str:
      """Download and store torchaudio assets to local file system.
  
      If a file exists at the download path, then that path is returned with or without
      hash validation.
  
      Args:
          key (str): The asset identifier.
          hash (str, optional):
              The value of SHA256 hash of the asset. If provided, it is used to verify
              the downloaded / cached object. If not provided, then no hash validation
              is performed. This means if a file exists at the download path, then the path
              is returned as-is without verifying the identity of the file.
          path (path-like object, optional):
              By default, the downloaded asset is saved in a directory under
              :py:func:`torch.hub.get_dir` and intermediate directories based on the given `key`
              are created.
              This argument can be used to overwrite the target location.
              When this argument is provided, all the intermediate directories have to be
              created beforehand.
          progress (bool): Whether to show progress bar for downloading. Default: ``True``.
  
      Note:
          Currently the valid key values are the route on ``download.pytorch.org/torchaudio``,
          but this is an implementation detail.
  
      Returns:
          str: The path to the asset on the local file system.
      """
      path = path or _get_local_path(key)
  
      if path.exists():
          _LG.info(
              "The local file (%s) exists. Skipping the download.", path
          )
      else:
          _LG.info("Downloading %s to %s", key, path)
          _download(key, path, progress=progress)
  
      if hash:
          _LG.info("Verifying the hash value.")
          digest = _get_hash(path, hash)
  
          if digest != hash:
              raise ValueError(
                  f"The hash value of the downloaded file ({path}), '{digest}' does not match "
                  f"the provided hash value, '{hash}'."
              )
  
          _LG.info("Hash validated.")
  
      return str(path)
  
file_path: audio/src/torchaudio/utils/download.py
imports: import hashlib
  import logging
  from os import PathLike
  from pathlib import Path
  from typing import Union
  import torch
  from torchaudio._internal import download_url_to_file
label_desc: Use image node_id 4 for calling a global function with example usage: download_asset(key, hash, path) and returns: str